What causes black roots in orchids?
Recently it has been found that some sellers intentionally or unintentionally sell Komatsunishiki as other orchid varieties. Komatsunishiki is not a Chunlan, Chunjian, Songchun, Jiuhua Lan (Huilan), Lianban Lan, or Douban Lan - none of them. Some honest sellers sell it on the foreign orchid side! 'Komatsunishiki' is called (Ezuka Lan) or (Kanchou...
Poor ventilation can be caused by many reasons. Sometimes it is poor permeability of the potting medium, sometimes the black plastic pot absorbing heat - if you sun the pot in summer, the inside of the pot becomes excessively hot and stuffy, or watering under high temperatures, or watering insufficiently, all of which can cause the crystal tips to carbonize.
When new roots are growing, the potting medium is too dry, the fertilizer is too heavy, and the medium is unevenly wet and dry and not breathable, causing this.
Solutions:
1. Near the pseudobulb base, it is best to have Ishiyaki stone the size of a soybean;
2. The potting medium should be matched to the environment. If the environment is relatively dry, the medium should be appropriately on the soft side;
3. When potting, the medium should be spread evenly, without too many gaps;